EP2922636A1 - Electrofilter for the purification of smoke from in particular minor straw boilers - Google Patents
Electrofilter for the purification of smoke from in particular minor straw boilersInfo
- Publication number
- EP2922636A1 EP2922636A1 EP13856293.9A EP13856293A EP2922636A1 EP 2922636 A1 EP2922636 A1 EP 2922636A1 EP 13856293 A EP13856293 A EP 13856293A EP 2922636 A1 EP2922636 A1 EP 2922636A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- collection
- plates
- electrofilter
- collection plate
- collection plates
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 239000000779 smoke Substances 0.000 title claims abstract description 9
- 238000000746 purification Methods 0.000 title claims abstract description 6
- 239000010902 straw Substances 0.000 title description 4
- 239000000428 dust Substances 0.000 claims abstract description 21
- 238000000034 method Methods 0.000 claims abstract description 3
- 238000007790 scraping Methods 0.000 claims abstract 2
- 229910000831 Steel Inorganic materials 0.000 claims description 2
- 239000010959 steel Substances 0.000 claims description 2
- 230000008602 contraction Effects 0.000 claims 1
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 abstract description 3
- 238000001914 filtration Methods 0.000 abstract description 3
- 239000003546 flue gas Substances 0.000 abstract description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract description 3
- 239000000126 substance Substances 0.000 abstract description 2
- 238000006073 displacement reaction Methods 0.000 abstract 1
- 230000000694 effects Effects 0.000 description 6
- 239000002245 particle Substances 0.000 description 4
- 150000002500 ions Chemical class 0.000 description 2
- 230000007935 neutral effect Effects 0.000 description 2
- TVEXGJYMHHTVKP-UHFFFAOYSA-N 6-oxabicyclo[3.2.1]oct-3-en-7-one Chemical compound C1C2C(=O)OC1C=CC2 TVEXGJYMHHTVKP-UHFFFAOYSA-N 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03C—MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03C3/00—Separating dispersed particles from gases or vapour, e.g. air, by electrostatic effect
- B03C3/34—Constructional details or accessories or operation thereof
- B03C3/74—Cleaning the electrodes
- B03C3/76—Cleaning the electrodes by using a mechanical vibrator, e.g. rapping gear ; by using impact
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03C—MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03C3/00—Separating dispersed particles from gases or vapour, e.g. air, by electrostatic effect
- B03C3/02—Plant or installations having external electricity supply
- B03C3/04—Plant or installations having external electricity supply dry type
- B03C3/08—Plant or installations having external electricity supply dry type characterised by presence of stationary flat electrodes arranged with their flat surfaces parallel to the gas stream
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03C—MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03C3/00—Separating dispersed particles from gases or vapour, e.g. air, by electrostatic effect
- B03C3/02—Plant or installations having external electricity supply
- B03C3/04—Plant or installations having external electricity supply dry type
- B03C3/10—Plant or installations having external electricity supply dry type characterised by presence of electrodes moving during separating action
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03C—MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03C3/00—Separating dispersed particles from gases or vapour, e.g. air, by electrostatic effect
- B03C3/34—Constructional details or accessories or operation thereof
- B03C3/40—Electrode constructions
- B03C3/41—Ionising-electrodes
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03C—MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03C3/00—Separating dispersed particles from gases or vapour, e.g. air, by electrostatic effect
- B03C3/34—Constructional details or accessories or operation thereof
- B03C3/40—Electrode constructions
- B03C3/45—Collecting-electrodes
- B03C3/47—Collecting-electrodes flat, e.g. plates, discs, gratings
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES
- F23J15/00—Arrangements of devices for treating smoke or fumes
- F23J15/02—Arrangements of devices for treating smoke or fumes of purifiers, e.g. for removing noxious material
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03C—MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03C2201/00—Details of magnetic or electrostatic separation
- B03C2201/04—Ionising electrode being a wire
Definitions
- Electrofilter for the purification of smoke from in particular minor straw boilers.
- the present invention relates to an electrofilter which consists in principle of two respectively positive and negative electrodes which are connected to a high voltage source.
- the type of voltage is normally a pulsating direct voltage generated by rectifying single-phased alternating voltage.
- the voltage level is 20 to 100 kV, depending on the size and design of the filter.
- the positive electrodes of the electrofilter consists normally of steel plates, so-called collection plates, suspended at a mutual distance of 100 to 400 mm, whereby parallel ducts are created between the plates through which the smoke to be purified passes in a horizontal flow. For safety reasons the collection plates are always earthed, see fig. 2.
- the negative electrodes, so-called discharge wires can be either thin wires, springs or rods suspended midway between the collection plates.
- the discharge wires When the voltage between the discharge wires and the collection plates is sufficiently high, the discharge wires will begin emitting electrons which will immediately move towards the positive collection plates. On the way the electrons will ionize the air molecules which will then be attracted by the neutral dust particles whereby these become negatively charged and attracted by the collection plates, see fig. 2.
- the dust particles from the smoke will little by little settle as a layer on the collection plates. The layer thickness will be largest at the inlet and will diminish exponentially in the longitudinal direction of the filter. Usually the dust layer is subsequently removed from the collection plates by knocking on these with hammers or vibrators. This frees the dust which falls down into dust hoppers underneath the collection plates. As the electric current runs from the discharge wires towards the collection plates, the collected dust must have some conducting capacity if the process is to continue unhindered with dust-coated collection plates.
- the conducting capacity is most often expressed by the resistivity which can be determined experimentally. If the resistivity in the collected dust is above a certain value, a relatively high voltage drop will occur above the dust layer on the collection plates.
- Claim 2 describes the design of the cutouts in the collection plates in an
- Claim 3 describes an alternative design of the cutouts in the collection plates in an electrofilter according to the invention. With the design described in claim 4 a cutting effect will be obtained at
- Claim 5 describes a third design of the cutouts in the collection plates of an eleetrofilter according to the invention.
- Fig. 1 is a known eleetrofilter
- Fig. 2 shows the purification principle of the eleetrofilter shown in fig. 1 ,
- Fig. 3 is a perspective and partial section view of an eleetrofilter with rotating collection plates
- Fig. 4 is a side view of an eleetrofilter with rotating collection plates
- Fig. 5 shows a drawing corresponding to the drawing shown in fig. 4, viewed from one end and with the discharge wires in drawn out position
- Fig. 6 shows a rotating collection plate in which each quadrant is designed with cutouts shaped as parts of circular rings which are mutually offset at the transition from one quadrant to the next.
- Fig. 7 shows a sectional view following the line l-l in fig. 6
- Fig. 8 shows a rotating collection plate with rectilinear, approximately radial cutouts
- Fig. 9 shows a rotating collection plate in which the cutouts are shaped as through bores.
- an electrofilter 6 As shown in fig.s 3 and 4 an electrofilter 6 according to the invention is designed with a row of, by way of example eleven, rotating circular collection plates 1 mounted at a uniform mutual distance on a rotating shaft 8.
- each collection plate 1 and a neighbouring plate discharge wires are placed which can be mounted on a frame 4, on which a vibrator 5 is mounted that can clean the discharge wires 3 of dust.
- the electrofilter 6 is fitted with stationary scrapers 10 which bear against each of the rotating collection plates 1 and clean them of dust, which drops into hoppers 11 and 12 below.
- the gas to be purified is led into the electrofilter through an entry hole 13 and after purification out through an exit hole 14.
- the rotating collection plates 1 are designed with cutouts 15, which can be circular as shown in fig. 6 or rectilinear and approximately radial as shown in fig. 8.
- cutouts 15 can be circular as shown in fig. 6 or rectilinear and approximately radial as shown in fig. 8.
- one side 16 of a cutout can be slightly inclined in relation to the other side 17 which is perpendicular to the surface of the collection plate 1. This way a cutting effect can be obtained at temperature fluctuations in a collection plate 1, which can break up any lumps of dust that may have collected in the cutouts.
- the collection plates 1 may also be designed with rows of through bores 18 instead of cutouts.
- the cutouts may also be shaped otherwise than shown in fig.s 6 and 8.
- Designing the collection plates with cutouts or through bores has the effect that the collection plates do not shrink and/or buckle at temperature fluctuations. Thus the desired and necessary cleaning effect can be obtained if stationary scrapers are used. To make it even more certain that the collection plates 1 will not buckle, guide rollers not shown in the drawing are mounted at each collection plate.
Abstract
Description
Claims
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
PL13856293T PL2922636T3 (en) | 2012-11-23 | 2013-10-16 | Electrofilter for the purification of smoke from in particular minor straw boilers |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DKPA201200739A DK177588B1 (en) | 2012-11-23 | 2012-11-23 | Electrofilter for cleaning the smoke of especially small straw boilers |
PCT/DK2013/000068 WO2014079447A1 (en) | 2012-11-23 | 2013-10-16 | Electrofilter for the purification of smoke from in particular minor straw boilers |
Publications (3)
Publication Number | Publication Date |
---|---|
EP2922636A1 true EP2922636A1 (en) | 2015-09-30 |
EP2922636A4 EP2922636A4 (en) | 2016-07-20 |
EP2922636B1 EP2922636B1 (en) | 2020-05-13 |
Family
ID=49510669
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP13856293.9A Active EP2922636B1 (en) | 2012-11-23 | 2013-10-16 | Electrofilter for the purification of smoke from in particular minor straw boilers |
Country Status (9)
Country | Link |
---|---|
US (1) | US9623422B2 (en) |
EP (1) | EP2922636B1 (en) |
KR (1) | KR20150088814A (en) |
CN (1) | CN104903002A (en) |
DK (1) | DK177588B1 (en) |
ES (1) | ES2804675T3 (en) |
NO (1) | NO20141082A1 (en) |
PL (1) | PL2922636T3 (en) |
WO (1) | WO2014079447A1 (en) |
Families Citing this family (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN105536996B (en) * | 2016-01-02 | 2020-01-14 | 浙江得美环保科技有限公司 | Electric dust remover |
DK179332B1 (en) * | 2016-07-17 | 2018-05-07 | Maskf Reka Holding A/S | Electrofilter |
US11695259B2 (en) | 2016-08-08 | 2023-07-04 | Global Plasma Solutions, Inc. | Modular ion generator device |
US11283245B2 (en) | 2016-08-08 | 2022-03-22 | Global Plasma Solutions, Inc. | Modular ion generator device |
US9789495B1 (en) * | 2016-08-15 | 2017-10-17 | John P. Dunn | Discharge electrode arrangement for disc electrostatic precipitator (DEP) and scrapers for both disc and discharge electrodes |
CN108014921A (en) * | 2017-12-04 | 2018-05-11 | 东北师范大学 | Multisensor crop straw burning electrostatic mixture collection device |
KR20230085946A (en) | 2018-02-12 | 2023-06-14 | 글로벌 프라즈마 솔루션스, 인코포레이티드 | Self cleaning generator device |
SE542576C2 (en) * | 2018-04-18 | 2020-06-09 | Eurus Airtech Ab | Highly resistive electrode elements for two-stage electrofilter |
US11581709B2 (en) | 2019-06-07 | 2023-02-14 | Global Plasma Solutions, Inc. | Self-cleaning ion generator device |
CN111355360B (en) * | 2020-04-08 | 2021-06-08 | 江西源能电气技术有限公司 | Current type frequency converter for impedance source alternating current |
Family Cites Families (21)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US1394771A (en) * | 1918-05-07 | 1921-10-25 | Research Corp | Apparatus for the electrical treatment of gases |
US1854650A (en) * | 1929-05-24 | 1932-04-19 | Int Precipitation Co | Collecting electrode for electrical precipitation apparatus |
GB368091A (en) | 1930-03-24 | 1932-03-03 | Jehan Bremond | Improvements relating to electrostatic apparatus for the separation, by ionisation, of particles in suspension in a fluid |
US2631687A (en) * | 1951-04-21 | 1953-03-17 | Francis J Dohrer | Rotary plate electrical precipitator |
GB987220A (en) * | 1961-01-18 | 1965-03-24 | Holmes & Co Ltd W C | An improved electrostatic precipitator |
FR1297911A (en) | 1961-05-26 | 1962-07-06 | Harris Engineering Company Ltd | Improvements to electrostatic precipitators |
JPS5023079A (en) * | 1973-07-04 | 1975-03-12 | ||
US4000994A (en) * | 1974-01-24 | 1977-01-04 | Joseph Youhouse | Electrostatic precipitation apparatus for vehicle engine exhaust |
US4221573A (en) * | 1979-03-06 | 1980-09-09 | Research-Cottrell, Inc. | Electrostatic precipitator rapping mechanism |
US4284420A (en) * | 1979-08-27 | 1981-08-18 | Borysiak Ralph A | Electrostatic air cleaner with scraper cleaning of collector plates |
US4539022A (en) * | 1984-03-30 | 1985-09-03 | General Electric Company | Rotating disk electrostatic precipitator with removable uniform flow duct |
AT388972B (en) * | 1985-04-02 | 1989-09-25 | Steyr Daimler Puch Ag | DEVICE FOR SEPARATING CARBON PARTICLES FROM THE EXHAUST GASES OF AN AIR-COMPRESSING, SELF-IGNITIONING INTERNAL COMBUSTION ENGINE |
US4932985A (en) * | 1989-05-05 | 1990-06-12 | Midwest Power Corp. | Rapper construction |
DE3942134C1 (en) * | 1989-12-20 | 1990-11-08 | Lta Lufttechnik Gmbh, 7590 Achern, De | |
CN2083073U (en) * | 1990-04-25 | 1991-08-21 | 郑州市中联环保设备研究所 | Driving electrostatic dust remover |
US5429669A (en) * | 1994-07-12 | 1995-07-04 | Chang; Chin-Chu | Electrostatic precipitator |
US6336961B1 (en) * | 1997-06-23 | 2002-01-08 | Sumitomo Heavy Industries, Ltd. | Electric precipitator and electric precipitation electrode used for the same |
US7241330B2 (en) * | 2004-10-25 | 2007-07-10 | Oreck Holdings, Llc | Air cleaner electrostatic precipitator cell |
WO2006134627A1 (en) * | 2005-06-13 | 2006-12-21 | Zesu Giko Co., Ltd. | Electrostatic precipitator |
US20090007788A1 (en) * | 2007-07-02 | 2009-01-08 | Noam Arye | Method and device for electrostatic cleaners |
US8257469B2 (en) * | 2009-03-18 | 2012-09-04 | Meister Environment Technology Ltd. | Electrostatic filter |
-
2012
- 2012-11-23 DK DKPA201200739A patent/DK177588B1/en active
-
2013
- 2013-10-16 CN CN201380061244.4A patent/CN104903002A/en active Pending
- 2013-10-16 KR KR1020157014484A patent/KR20150088814A/en not_active Application Discontinuation
- 2013-10-16 EP EP13856293.9A patent/EP2922636B1/en active Active
- 2013-10-16 PL PL13856293T patent/PL2922636T3/en unknown
- 2013-10-16 WO PCT/DK2013/000068 patent/WO2014079447A1/en active Application Filing
- 2013-10-16 ES ES13856293T patent/ES2804675T3/en active Active
- 2013-10-16 US US14/382,622 patent/US9623422B2/en active Active
-
2014
- 2014-09-05 NO NO20141082A patent/NO20141082A1/en not_active Application Discontinuation
Also Published As
Publication number | Publication date |
---|---|
US9623422B2 (en) | 2017-04-18 |
EP2922636A4 (en) | 2016-07-20 |
EP2922636B1 (en) | 2020-05-13 |
US20150246363A1 (en) | 2015-09-03 |
WO2014079447A1 (en) | 2014-05-30 |
PL2922636T3 (en) | 2020-09-21 |
KR20150088814A (en) | 2015-08-03 |
ES2804675T3 (en) | 2021-02-09 |
NO20141082A1 (en) | 2014-11-12 |
DK177588B1 (en) | 2013-11-04 |
CN104903002A (en) | 2015-09-09 |
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